package Collection;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

/**
 * 备选课程类
 * @author Administrator
 */
public class ListTest {

    /**
     *用于存放备选课程的List
     */
    public List coursesToSelect;

    public ListTest() {
        this.coursesToSelect = new ArrayList();
    }

    /**
     * 用于往coursesToSelect中添加备选课程
     */
    public void testAdd() {
        // 创建一个课程对象，并通过调用add方法添加到备选课程List中
        Course cr1 = new Course("1","数据结构");
        coursesToSelect.add(cr1);
        Course temp = (Course) coursesToSelect.get(0); //对象存入集合都编程Object类型，取出时需要类型转换
        System.out.println("添加了课程：" + temp.id + ":" + temp.name);

        Course cr2 = new Course("2", "C语言");
        coursesToSelect.add(0, cr2);
        Course temp2 = (Course) coursesToSelect.get(0);
        System.out.println("添加了课程：" + temp2.id + ":" + temp2.name);

        coursesToSelect.add(cr1);
        Course temp0 = (Course) coursesToSelect.get(2);
        System.out.println("添加了课程：" + temp.id + ":" + temp.name);


        //以下方法会抛出下标越界异常
//		Course cr3 = new Course("3", "test");
//		coursesToSelect.add(4, cr3);

        Course[] course = {new Course("3", "离散数学"), new Course("4", "汇编语言")};
        coursesToSelect.addAll(Arrays.asList(course));  // 将数组转为List
        Course temp3 = (Course) coursesToSelect.get(2);
        Course temp4 = (Course) coursesToSelect.get(3);

        System.out.println("添加了两门课程" + temp3.id + ":" +
                temp3.name + ";" + temp4.id + ":" + temp4.name);

        Course[] course2 = {new Course("5", "高等数学"), new Course("6", "大学英语")};
        coursesToSelect.addAll(2, Arrays.asList(course2));
        Course temp5 = (Course) coursesToSelect.get(2);
        Course temp6 = (Course) coursesToSelect.get(3);
        System.out.println("添加了两门课程" + temp5.id + ":" +
                temp5.name + ";" + temp6.id + ":" + temp6.name);

    }

    /**
     * 取得List中的元素的方法
     *
     * @param args
     */
    public void testGet() {
        int size = coursesToSelect.size();
        System.out.println("有如下课程待选：");
        for (int i = 0; i < size; i++) {
            Course cr = (Course) coursesToSelect.get(i);
            System.out.println("课程：" + cr.id + ":" + cr.name);
        }
    }

    /**
     * 通过迭代器来遍历List
     *
     * @param args
     */
    public void testIterator() {
        //ͨ通过iterator来遍历List
        Iterator<Course> it = coursesToSelect.iterator();
        System.out.println("通过迭代器访问：");
        while (it.hasNext()) {
            Course cr = it.next();
            System.out.println("课程：" + cr.id + ":" + cr.name);
        }
    }

    /**
     * ͨ通过for each访问集合元素
     *
     * @param args
     */
    public void testForEach() {
        System.out.println("通过foreach访问集合元素");
        for (Object obj : coursesToSelect) {
            Course cr = (Course) obj;
            System.out.println("课程" + cr.id + ":" + cr.name);
        }
    }

    /**
     * 修改List中元素
     *
     * @param args
     */
    public void testModify() {
        coursesToSelect.set(4, new Course("7", "毛概"));
    }

    /**
     * 删除List中的元素
     *
     * @param args
     */
    public void testRemove() {
		//Course cr = (Course) coursesToSelect.get(4);
        System.out.println("4和5位置课程即将被删除");
        Course[] courses = {(Course) coursesToSelect.get(4), (Course) coursesToSelect.get(5)};
        coursesToSelect.removeAll(Arrays.asList(courses));
        //		coursesToSelect.remove(4);
        System.out.println("成功删除课程！");
        testForEach();
    }

    /**
     * 往List中添加一些奇怪的东西
     *
     * @param args
     */
    public void testType() {
        System.out.println("能够往List中添加一些奇怪的东西呢");
        coursesToSelect.add("我不是课程，我只是一个无辜的字符串");
    }

    public static void main( String[] args ) {
        ListTest lt = new ListTest();
        lt.testAdd();
        lt.testType();
        lt.testForEach();
//		lt.testGet();
//		lt.testIterator();
//		lt.testForEach();
//		lt.testModify();
//		lt.testForEach();
//		lt.testRemove();
    }
}
